Oil & Gas Geology ›› 2006, Vol. 27 ›› Issue (4): 467-474.doi: 10.11743/ogg20060405

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Characteristics and formation mechanism of the faults in Mesozoic-Cenozoic in Jiyang Depression

Zhang Peng, Wang Liangshu, Ding Zengyong, Zhong Kai   

  1. Department of Earth Sciences, Nanjing University, Nanjing 210093
  • Received:2006-07-06 Online:2006-08-25 Published:2012-01-16

Abstract:

Dominated by NW-trending faulting during the Mesozoic and jointly controlled by NW-and NE-trending faults in the Early Cenozoic,Jiyang depression was then governed by NE-trending faulting after the deposition of 4th Member in the Shahejie Formation.The faulting in Jiyang depression in Mesozoic-Cenozoic was jointly controlled by back-arc spreading resulted from the oblique subduction of the Pacific plate towards the Eurasia plate and the strike-slip movement of the Tanlu fault zone. A series of NW-trending normal faults were formed as a response to a sinistral strike slip of the Tanlu fault belt during the Early Cretaceous.In the Early Cenozoic,faulting in the eastern Jiyang depression was controlled by the sinistral strike slip of the Tanlu fault belt,while in the western part of the depression,it was mainly affected cy the back-arc spreading process.After about 43Ma when the convergence direction of the Pacific plate changed,the faulting in Jiyang depression was mainly controlled by the NW-SE trending regional spreading process.

Key words: The subduction of Pacific plate, fault activity, formation mechanism, Tanlu fault zone, Mesozoic-Cenozoic, Jiyang depression

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